不同晶型TiO_(2)消光PET的流变性能研究  

Study on rheological properties of dull PET with TiO_(2)in different crystal forms

作　　者：路广 李映 闻秀银 严岩 LU Guang;LI Ying;WEN Xiuyin;YAN Yan(SINOPEC Yizheng Chemical Fiber Co.,Ltd.,Yizheng 211900)

机构地区：[1]中国石化仪征化纤有限责任公司,江苏仪征211900

出　　处：《合成纤维工业》2021年第2期27-31,共5页China Synthetic Fiber Industry

基　　金：中石化科技开发项目(YZBC160116)。

摘　　要：分别以金红石型二氧化钛(TiO_(2))粉体和锐钛矿型TiO_(2)粉体为消光剂,通过原位聚合制备不同TiO_(2)粉体含量的消光聚对苯二甲酸乙二醇酯(PET),研究了不同晶型TiO_(2)消光PET的流变性能。结果表明:在剪切速率()为4000~7000 s^(-1),金红石型TiO_(2)和锐钛型TiO_(2)消光PET熔体的表观黏度(η_(a))随的变化幅度均较小,均具有良好的纺丝稳定性;相同温度下,金红石型TiO_(2)消光PET的非牛顿指数(n)小于锐钛型TiO_(2)消光PET,但随着温度升高,金红石型TiO_(2)消光PET的n上升幅度大,其η_(a)对变化更为敏感;在常规纺丝条件下,金红石型TiO_(2)消光PET的黏流活化能(E_(η))明显小于锐钛型TiO_(2)消光PET,TiO_(2)含量较低时金红石型TiO_(2)消光PET的η_(a)对温度变化的敏感程度较小;相同温度下,金红石型TiO_(2)消光PET熔体的结构黏度指数(η)高于锐钛型TiO_(2)消光PET;在纺丝温度有波动的情况下,金红石型TiO_(2)消光PET可纺性好,但其纺丝工艺窗口较窄,应采用更高的纺丝温度以获得良好的纺丝效果。Dull poly(ethylene terephthalate)(PET)with different content of TiO_(2)powder was prepared by in-situ polymerization using rutile titanium dioxide(TiO_(2))powder and anatase TiO_(2)powder as flatting agent.The rheological properties of dull PET with TiO_(2)of different crystal forms were studied.The results showed that the apparent viscosity(η_(a))of rutile TiO_(2)and anatase TiO_(2)dull PET melts changed little with the shear rate()in 4000-7000 s^(-1),indicating that the melts both had good spinning stability;the non-Newtonian index(n)of rutile TiO_(2)dull PET was lower than that of anatase TiO_(2)dull PET at the same temperature,but increased greatly with the increase of temperature,and itsη_(a)was more sensitive to;the viscous flow activation energy(E_(η))of rutile TiO_(2)dull PET was significantly lower than that of anatase TiO_(2)dull PET under the conventional spinning conditions,and theη_(a)of rutile TiO_(2)dull PET was less sensitive to the change of temperature when the content of TiO_(2)was low;the structural viscosity index(η)of rutile TiO_(2)dull PET melt was higher than that of anatase TiO_(2)dull PET melt at the same temperature;rutile TiO_(2)dull PET had fairly good spinnability under the fluctuation of spinning temperature,but the spinning process window was narrow,so the satisfying spinning effect would be acquired by applying higher spinning temperature.

关 键 词：聚对苯二甲酸乙二醇酯 消光剂 金红石型二氧化钛 锐钛矿型二氧化钛 流变性能 

分 类 号：TQ342.21[化学工程—化纤工业]